真空系统采用复合真空计及真空机组，测量范围宽、设备紧凑、密封性能好。
1·As an important part of the ship, canopy plays the role of hermetization and protection of cargo, which influences the safeness of cargo directly in transportation.
舱盖是船舶上的重要组成部分，起着密封、保护货物的作用，它直接关系到货物运输过程中的安全。
2·The vacuum system USES a compact vacuum pump group and compound gauges with wide measuring range and good hermetization.
真空系统采用复合真空计及真空机组，测量范围宽、设备紧凑、密封性能好。